03/29/2013 10:13 am ET

Mystery Malady Kills More Bees, Heightening Worry on Farms

A mysterious malady that has been killing honeybees en masse for several years appears to have expanded drastically in the last year, commercial beekeepers say, wiping out 40 percent or even 50 percent of the hives needed to pollinate many of the nation’s fruits and vegetables.

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